Improvement in dumb-waiters



A. Gannon.

DUMB-WAITER.

Patented Feb 8; 1876.

m M M Min 5MB N-PETERS, PHOTO-LITHOGRAFHER, WASHINGTON. D. Q

lllvrrnn STATES PATENT FFFIC.

ANDREW GORDON, on NEW YORK, n. Y.

IMPROVEMENT m DUMB-W'AITIERS.

Specification forming part of Letters Patent No. 173,279, dated February 8, 1876; application filed Y i December 18, 1875.

To all whom it may concern:

Be it known that I, ANDREW GORDON, of

v the city of New York, in the county and State of New York, have invented new and useful Improvements inDumb-Waiters and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates particularly to elevating apparatus of the class known as dumbwaiters, which are operated by hand-power,

and used principally in dwelling-houses for raising and lowering comparatively light weights; but it is also applicable to elevators of various descriptions.

The invention consists in a novel combination and arrangement of the rope or cord and the-pulleys with relation to each other, and

or platform securely in place at desired heights while being loaded or unloaded.

The manner of carryingout my invention is illustrated in the accompanying drawing, in which- Figure l is a vertical sectional view of a dumb-waiter embodying my improvements, taken in the line a; w of Fig. 4. Fig. 2 is a vertical section taken in the line y y of Fig. 1. Fig. Bis a similar view, looking in the opposite direction. Fig. 4 is a section taken in the line 2 z of Fig. 1. Fig. 5 is a section taken in the line w w of Fig. l.

The casing which incloses the apparatus is constructed with side walls A A and a rear wall, A and suitable doors may be provided for each floor or story of the building in which the apparatus is used, When it is intended to be used by the occupants of two houses or rooms separated by the wall near which it is placed, the rear wall A of the casing is dispensed with, and doors may be provided instead thereof. The shelves constituting the dumb-waiter proper may be of any suitable construction. They are here shown as attached to a frame, B, arranged to slide vertically in the casing, and provided with guides a, in the usual manner. The frame B may beprovided with a counterbalance-weight, 0, connected with it by a cord, 0, passing over a pulley, d, and working behind the rear wall A When used for two adjoining houses or rooms, as before mentioned, the weight may be arranged to work at one side instead of behind the rear wall.

The working parts of the apparatus are arranged and operated as follows: A rope or cord, E, has one end fastened near the upper end of the casing, as shown at e, from whence it passes downward, and then horizontally under two pulleys, D D having their bearings in the upper portion of the frame B; thence upward and over a pulley, D having its bear- 7 in gs near the upper portion of the side wall A thence downward and'horizontall y under two pulleys, D D, near the bottom of the casing; thence upward and overa pulley or pulleys, 1),

near the upper portion of the side wall A thence downward and under a pulley, D near the bottom of said side wall A; thence upward and horizontally over two pulleys, D D hav ing their hearings in the lower portion of the frame B thence downward to a drum or shaft, G, to which the other end is fastened, as shown at e In some cases a single pulley may be used where two pulleys are here shown but I prefer the arrangement shown, as thereby the parts are more conveniently bestowed and less liable to get out of order.

By this arrangement of the cord and pulleys with relation to each other and to the frame or platform, the friction is divided, less power is required to operate the apparatus, and the raising and lowering of the frame are both accomplished by pulling downward on the rope or cord, as the frame is raised by pulling downward on the portion of the rope nearest the wall A and is lowered by pulling downward on the opposite portion, or that nearest the wall A}, thus avoiding the necessity for pulling upward on the rope in order to lower the frame or platform, as in dumb-waiters as heretofore constructed.

The shaft. or drum G is provided with a ratchet, g, with which engages a pivoted pawl, h. When the rope or cord E is so strained as fitting a square projection thereon.

In order to enable the frame B to be held stationary at any desired height in the casing, so as to prevent it from being raised or lowered by a person in one story of the building while being loaded or unloaded at another story, a locking-device for the rope is provided, consisting of two cam-levers, J J pivoted to one of the side walls of the casing, so as to allow the rope or cord to be inserted between the faces of the cams.

One of these cam-levers is provided with a stop, 1', for limiting its backward motion. By raising one of the levers, inserting the rope between the cams, and then depressing the lever, the rope is securely locked and prevented from moving.

I am aware that a single cam has been used for clampinga rope between the face of the cam and a fixed bearing-surface; but such arrangement serves to hold the rope when the strain is in one direction only, while in my invention the rope is prevented 'from moving in either-direction, the upward strain being received by the cam J, and the downward strain by the cam J What I claim as new, and desire to secure by Letters Patent, is

The combination, with the carriage B, having the upper and lower set of pulleys D D of a pair of cords arranged and passing over pulleys, as herein shown and described, whereby the carriage can be raised and lowered by pulling downward on first one and then the other cord, as set forth.

ANDREW GORDON. Witnesses:

J OHN GORDON,

WILLIAM GORDON. 

